Luminous thermometer



P. PlTKiN. LUMINOUS THERMOMETER. APPLICATION FILED AUG-30.19%9.

Patented Apr. 27, 1920 INVENTOB Gem 9e P PM?! 1) JTTURNEYS' GEORGE 3?. PITKIN, OF BERGENFIELD, NEW JERSEY.

LUMINQUS THEZIELMOlVITE'J IIER.

Specification of Letters Patent.

Patented Apr. 27, 1920.

Application filed August 30, 1919. Serial No. 320,814.

To all whom it may concern Be it known that I, (inoron l7. PrrniN, a citizen of the. United States, and a resident of the city 01 Bergenlield. in the county of Bergen and State of New Jersey, have in vented a new and improved Luminous Thermometer, of which the following is a full, clear, and exact description.

This invention relates to improvements in luminous thermometers, an object of the. invention being to provide athermometer which can be easily read in the dark.

A further object is to provide an improved attachment which can be placed on any ordinary thermometer tube and which will disclose the position of the expansible column or registering agent in the tube. in the dark as well as in the light.

A further object is to provide a device of the character stated which is especially adapted for use with a. radiator thermomefor for automol. iles, such as disclosed in my co-pending application filed. Au ust 22, 191$), and given Serial Number 319,1;2.

Vith these and other objects in view, the invention consists in certain novel features of construction and rangemcnts oi parts hereinafter described claims.

In the accompanying drawingsf Figure l is a view in elevation illustrating. my improvements.

Fig. 2 is a perspective view of the attachment.

Fig. 3 is an enlarged view in section on the line 3-3 of Fig. l.

Fig. 4 a fragmentary view in elevation illustrating a modification.

Fig. 5 is an enlarged view in section on the line of Fig. 4.

1 represents an ordinary thermometer tube containing an expansible liquid 2,

3 represents my improved attachi'nent which is of general semi-cylindrieal 'form as will be more fully and pointed out in the adapted to lit around the rear portion of the.-

tube 1, and having curved spring tongues 4-. at its ends to grip the tube and hold the attachment securely clamped thereonv combinations and a1-v "lhe intermediate portion of the attachment is depressed or grooved, forming a pocket 5 to receive the luminous material 6 The pocket 5 extends throughout the lengthof the attachment and is of a width appre ciably greater than the column of liquid in the tube, so that the luminous material 6 plainly discloses the position of the column, even in the dark.

The attachment can be easily and quickly attached to the tube and the luminous material can be replaced as occasion may require.

In the modification shown in Figs. land 5, the tube '7 is provided with a. longitudinal pocket'il Wider than the liquid column 9 and this pocket is filled with luminous material 6 toexpose the column in the dark.

Various slight'changes might be made in the general form of the parts described without departing from my invention, and hence l do not limit myself to the precise details set forth but consider myself at. liberty to make such. slight changes and alterations as fairly fall within the spirit and scope of: the appended claims.

I claim:

1. The combination with a thermometer tube having therein an expansible liquid, of

ill

a semi-cylindrical casing fitting the tube, 3

curved spring tongues on the casing engagmg the tube and clamping the casing thereagainst, said casing havmr at its internie 'diate. portion a longitud nal groove, and

luminous material located in. said groove, said luminous material and groove ,wider than the internal diameter of the tube.

2. The coml i'nation with a thermometer tube having tlirein an expansihle liquid, oi a semi-cylindrical casing fitting the tube, curved spring toingues at the ends of the easing at the edges thereof engaging the. tube and clamping the casing thereagainst, said casing having at its intermediate portion a longitudinal groove, and luminous material located in said groove, said luminous ma terial and groove wider than the internal diameter of the tube.

GEORGE P. PITKIN. 

